Use Decorrelation Stretch to remove the high correlation commonly found in multispectral data sets to produce a more colorful color composite image. The highly correlated data sets often produce quite bland color images. Decorrelation stretching requires three bands for input. These bands should be stretched byte data or may be selected from an open color display.

You can also write a script to produce a decorrelated image using the DecorrelationStretch task.

  1. From the Toolbox, select Transform > Decorrelation Stretch. The Decorrelation Stretch dialog appears.
  2. Select the Input Raster from the drop-down list.
  3. Optionally select the bands to use from the Use Bands list. Select one band each for R, G, and B.
  4. Enter a filename and location for the Output Raster.
  5. Enable the Preview check box to see a preview of the settings before you click OK to process the data. The preview is calculated only on the area in the Image window. See Preview for details on the results. To preview a different area in your image, pan and zoom to the area of interest and reenable the Preview option.
  6. Enable the Display result check box to display the output image in the Image window when processing is complete.
  7. To run the process on a local or remote ENVI Server, click the down arrow and select Run Task in the Background or Run Task on remote ENVI Server name. The ENVI Server Job Console will show the progress of the job and will provide a link to display the result when processing is complete. See the ENVI Servers topic for more information.

  8. Click OK. ENVI adds the resulting output to the Data Manager and, if the Display Result check box was enabled, adds the layer to the Layer Manager and displays the output in the Image window.